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// SPDX-License-Identifier: GPL-2.0
#include <stdio.h>
#include "api/fs/fs.h"
#include "util/pmu.h"
#include "util/topdown.h"
#include "util/evlist.h"
#include "util/debug.h"
#include "util/pmu-hybrid.h"
#include "topdown.h"
#include "evsel.h"
#define TOPDOWN_L1_EVENTS "{slots,topdown-retiring,topdown-bad-spec,topdown-fe-bound,topdown-be-bound}"
#define TOPDOWN_L1_EVENTS_CORE "{slots,cpu_core/topdown-retiring/,cpu_core/topdown-bad-spec/,cpu_core/topdown-fe-bound/,cpu_core/topdown-be-bound/}"
#define TOPDOWN_L2_EVENTS "{slots,topdown-retiring,topdown-bad-spec,topdown-fe-bound,topdown-be-bound,topdown-heavy-ops,topdown-br-mispredict,topdown-fetch-lat,topdown-mem-bound}"
#define TOPDOWN_L2_EVENTS_CORE "{slots,cpu_core/topdown-retiring/,cpu_core/topdown-bad-spec/,cpu_core/topdown-fe-bound/,cpu_core/topdown-be-bound/,cpu_core/topdown-heavy-ops/,cpu_core/topdown-br-mispredict/,cpu_core/topdown-fetch-lat/,cpu_core/topdown-mem-bound/}"
/* Check whether there is a PMU which supports the perf metrics. */
bool topdown_sys_has_perf_metrics(void)
{
static bool has_perf_metrics;
static bool cached;
struct perf_pmu *pmu;
if (cached)
return has_perf_metrics;
/*
* The perf metrics feature is a core PMU feature.
* The PERF_TYPE_RAW type is the type of a core PMU.
* The slots event is only available when the core PMU
* supports the perf metrics feature.
*/
pmu = perf_pmu__find_by_type(PERF_TYPE_RAW);
if (pmu && pmu_have_event(pmu->name, "slots"))
has_perf_metrics = true;
cached = true;
return has_perf_metrics;
}
/*
* Check whether we can use a group for top down.
* Without a group may get bad results due to multiplexing.
*/
bool arch_topdown_check_group(bool *warn)
{
int n;
if (sysctl__read_int("kernel/nmi_watchdog", &n) < 0)
return false;
if (n > 0) {
*warn = true;
return false;
}
return true;
}
void arch_topdown_group_warn(void)
{
fprintf(stderr,
"nmi_watchdog enabled with topdown. May give wrong results.\n"
"Disable with echo 0 > /proc/sys/kernel/nmi_watchdog\n");
}
#define TOPDOWN_SLOTS 0x0400
/*
* Check whether a topdown group supports sample-read.
*
* Only Topdown metric supports sample-read. The slots
* event must be the leader of the topdown group.
*/
bool arch_topdown_sample_read(struct evsel *leader)
{
if (!evsel__sys_has_perf_metrics(leader))
return false;
if (leader->core.attr.config == TOPDOWN_SLOTS)
return true;
return false;
}
const char *arch_get_topdown_pmu_name(struct evlist *evlist, bool warn)
{
const char *pmu_name;
if (!perf_pmu__has_hybrid())
return "cpu";
if (!evlist->hybrid_pmu_name) {
if (warn)
pr_warning("WARNING: default to use cpu_core topdown events\n");
evlist->hybrid_pmu_name = perf_pmu__hybrid_type_to_pmu("core");
}
pmu_name = evlist->hybrid_pmu_name;
return pmu_name;
}
int topdown_parse_events(struct evlist *evlist)
{
const char *topdown_events;
const char *pmu_name;
if (!topdown_sys_has_perf_metrics())
return 0;
pmu_name = arch_get_topdown_pmu_name(evlist, false);
if (pmu_have_event(pmu_name, "topdown-heavy-ops")) {
if (!strcmp(pmu_name, "cpu_core"))
topdown_events = TOPDOWN_L2_EVENTS_CORE;
else
topdown_events = TOPDOWN_L2_EVENTS;
} else {
if (!strcmp(pmu_name, "cpu_core"))
topdown_events = TOPDOWN_L1_EVENTS_CORE;
else
topdown_events = TOPDOWN_L1_EVENTS;
}
return parse_events(evlist, topdown_events, NULL);
}
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